jewel-blocks

The Sailor's Word-Book

Are attached to eye-bolts on those yards where studding-sails are hoisted, and carry these sails to the extreme ends of the yards. When these jewel-blocks are removed, it is understood that there is no intention to proceed to sea, and vice versâ. The halliards, by which the studding-sails are hoisted, are passed through the jewel-block, whence, communicating with a block on the several mast-heads, they lead downwards to the top or decks, where they may be conveniently hoisted. (See sail.)

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